Robust entanglement with a thermal mechanical oscillator

Rakhubovsky, Andrey A.; Filip, Radim

doi:10.1103/physreva.91.062317

Cited by 17 publications

(14 citation statements)

References 30 publications

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“…The values of n 0 achievable by auxiliary cooling are then able to test the possibility to observe thermal entanglement between atoms and mechanics. 75,76 To ensure good temporal modematching, we consider only long pulses with κ a;m τ ) 1. In the adiabatic case of the optomechanical interaction, when the optical mode reacts to any changes instantaneously (κ m ) γ m ; τ À1 ), while the coupling constants are much smaller than the linewidth of the cavity (κ m ) g; G) and the interaction is faster than the rethermalization rate (τ ( Γ À1 m ), Eqs.…”

Section: Quantum Hybrid Qnd Gatementioning

confidence: 99%

Pulsed atom-mechanical quantum non-demolition gate

2020

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Hybridization of quantum science and technology crucially depends on quantum gates between various physical systems. The different platforms have different fundamental physics and, therefore, diverse advantages in various applications. Many applications require nearly ideal quantum gates with variable large interaction gain and sufficient entangling power. Moreover, pulsed gates are advantageous for fast quantum circuits. For quantum systems with continuous variables, the quantum nondemolition (QND) gate is the most basic. It is an entangling gate that simultaneously keeps a variable of the interacting system unchanged. This feature is useful for quantum circuits from quantum sensing to continuous variable quantum computing. Currently, atomic ensembles storing quantum states of radiation and mechanical oscillators transducing them are two major but very different continuous-variable matter platforms. We propose a high-quality continuous-variable QND gate between an atomic ensemble and a mechanical oscillator in the separated optical cavities connected by propagating optical pulses. We demonstrate that squeezing of light pulses, homodyne measurement, and optimized feedforward control used to build the gate are sufficient to reach an interaction gain up to 50 with nearly ideal entangling power.

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Section: Quantum Hybrid Qnd Gatementioning

confidence: 99%

Pulsed atom-mechanical quantum non-demolition gate

2020

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“…The two-mode squeezing interaction is known for its ability to entangle the modes and produce correlations sufficient to achieve conditional squeezing (CS) [45,46]. The latter effect manifests itself as a projection of one of the two correlated modes onto a state which has the variance of one of the quadratures below the shot-noise level.…”

Section: Conditional Squeezing In the Adiabatic Regimementioning

confidence: 99%

Nonclassical states of levitated macroscopic objects beyond the ground state

Rakhubovsky¹,

Moore²,

Filip³

2019

Quantum Sci. Technol.

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The preparation of nonclassical states of mechanical motion conclusively proves that control over such motion has reached the quantum level. We investigate ways to achieve nonclassical states of macroscopic mechanical oscillators, particularly levitated nanoparticles. We analyze the possibility of the conditional squeezing of the levitated particle induced by the homodyne detection of light in a pulsed optomechanical setup within the resolved sideband regime. We focus on the regimes that are experimentally relevant for the levitated systems where the ground-state cooling is not achievable and the optomechanical coupling is comparable with the cavity linewidth. The analysis is thereby performed beyond the adiabatic regime routinely used for the bulk optomechanical pulsed systems. The results show that the quantum state of a levitated particle could be squeezed below the ground state variance within a wide range of temperatures. This opens a path to test for the first time nonclassical control of levitating nanoparticles beyond the ground state.

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“…Thanks to the fast growing field of cavity optomechanics [10,11], which provides a versatile platform to prepare such an entangled state in mechanical motions, research in the area has virtually exploded in recent times. Relying on the generic radiation-pressure coupling, much studies have already been reported on the entanglement generation between a cavity field and a mechanical oscillator [12][13][14][15][16][17][18][19]. Besides, based on similar architecture, a lot of emphasis has been currently brought forward to realize entanglement between two macroscopic mechanical oscillators.…”

Section: Introductionmentioning

confidence: 99%

Entanglement dynamics of two coupled mechanical oscillators in modulated optomechanics

Chakraborty

Sarma

2018

Phys. Rev. A

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We study the entanglement dynamics of two coupled mechanical oscillators, within a modulated optomechanical system. We find that, depending on the strength of the mechanical coupling, one could observe either a stationary or a dynamical behavior of the mechanical entanglement, which is extremely robust against the oscillator temperature. Moreover, we have shown that this entanglement dynamics is strongly related to the stability of the normal modes. Taking mechanical damping effects into account, an analytical expression corresponding to the critical mechanical coupling strength, where the transition from stationary to dynamical entanglement occurs is also reported. The proposed scheme is analysed with experimentally realistic parameters, making it a promising mean to realize macroscopic quantum entanglement within current state-of-the-art experimental setups.

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Robust entanglement with a thermal mechanical oscillator

Cited by 17 publications

References 30 publications

Pulsed atom-mechanical quantum non-demolition gate

Pulsed atom-mechanical quantum non-demolition gate

Nonclassical states of levitated macroscopic objects beyond the ground state

Entanglement dynamics of two coupled mechanical oscillators in modulated optomechanics

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